v3.26.1
Accumulated Other Comprehensive Income/Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net year-to-date other comprehensive income/(loss), taxes $ (0.1) $ (0.2)
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 18,467.0 16,890.0
Other comprehensive income/(loss) before reclassifications 38.0 3.0
Amounts reclassified from accumulated other comprehensive income/(loss) 0.0 0.0
Total other comprehensive income/(loss) [1] 38.0 3.0
Ending balance 19,418.0 16,039.0
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance [2] (591.0) (723.0)
Total other comprehensive income/(loss) [2] 38.0 3.0
Ending balance [2] (553.0) (720.0)
Defined benefit plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (427.0) (498.0)
Other comprehensive income/(loss) before reclassifications (1.0) 3.0
Amounts reclassified from accumulated other comprehensive income/(loss) 0.0 0.0
Total other comprehensive income/(loss) (1.0) 3.0
Ending balance (428.0) (495.0)
Foreign currency translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (179.0) (241.0)
Other comprehensive income/(loss) before reclassifications 39.0 0.0
Amounts reclassified from accumulated other comprehensive income/(loss) 0.0 0.0
Total other comprehensive income/(loss) 39.0 0.0
Ending balance (140.0) (241.0)
Derivative instruments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 15.0 16.0
Other comprehensive income/(loss) before reclassifications 0.0 0.0
Amounts reclassified from accumulated other comprehensive income/(loss) 0.0 0.0
Total other comprehensive income/(loss) 0.0 0.0
Ending balance $ 15.0 $ 16.0
[1] Net of deferred taxes of ($0.1) million and ($0.2) million during the three months ended March 31, 2026 and 2025, respectively.
[2] AOCI = accumulated other comprehensive income/loss (Note 8)